JPS586621Y2 - Welding gun for robots - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a welding gun for a robot that evenly presses an electrode against a workpiece, and is designed to operate smoothly and quickly.

To explain this with reference to the illustrated embodiment, reference numeral 1 denotes a welding gun, and the welding gun 1 has a cylinder 4 on an arm 3 to which a fixed electrode 2 is attached, and a movable electrode 7 on a piston rod 6 provided on a piston 5 of the cylinder 4. The cylinder 4 is formed into a so-called C-type gun, and an auxiliary cylinder 9 is integrally provided with the cylinder 4 through its rear partition wall 8, and the cylinder 9 is a retracting cylinder that communicates with the retracting pipe connection port 10 of the cylinder 4. A rod 12 provided on the piston 11 is provided with a stopper 13 whose length can be adjusted freely, and a pair of threaded arm rods 15, 15 are attached to the receiving frame 14 that the stopper 13 comes into contact with, sandwiching the cylinder 4 therebetween. The arm rod 15,1 is provided protrudingly.
A pair of front and rear brackets N6, 16 are provided on the outer periphery of the cylinder 4 so as to be slidably supported by the cylinder 4, and an adjuster 17 is screwed into the front bracket 16 and the arm rod 15 so as to be adjustable. A spring 18 is interposed between the cylinder 4 and the receiving frame 14 so that the cylinder 4 is slidably supported.

In the figure, 19 is the advancement pipe connection port of the cylinder 4, 20 is the air vent hole of the auxiliary cylinder 9, 21 is an adjustable receiving piece screwed to the arm rod 15, and 22 is the robot arm that supports the receiving frame 14. show.

Since the present invention is constructed as described above, when the welding gun 1 supported by the robot arm 22 moves to a state where it grips the workpiece a as shown in the second figure, the cylinder 4 is moved forward. When pressurized fluid is supplied from the pipe connection port 19, the piston 5 moves forward and stops at 1 where the movable electrode 7 contacts the workpiece a, so that the supply of pressurized fluid to both layers is carried out by moving the cylinder 4 backward and moving the piston 5 to the fixed electrode. Hold work a with 2,
In this way, the electrodes 2 and 7 hold the workpiece with equal pressure and are electrically welded, and when pressurized fluid is supplied from the afterflow pipe connection port 10 after welding, the piston 5 of the cylinder 4 retreats and at the same time the auxiliary cylinder 9 is welded. Since pneumatic pressure is also applied to the piston 11, the cylinder 4 is moved forward by the stopper 13 which prevents its retreat, and thus the electrodes 2 and 7 are simultaneously retreated from the workpiece to speed up their return. According to the invention, an auxiliary cylinder 9 for retraction which communicates with a retraction pipe connection port 10 of the cylinder 4 through a partition wall 8 is provided in the cylinder 4 which is buttoned to the C-type gun 1, and the piston 11 of the cylinder 9 has a length. Since the adjustable stopper 13 is provided and the cylinder 4 is slidably supported by the receiving frame 14 that the stopper 13 contacts, the gun 1 after pressure welding is
The return is quick and the return position is also at the stopper 13.
can be freely selected, and has the effect of significantly shortening the working time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a plan view and FIG. 2 being a partially cutaway side view. DESCRIPTION OF SYMBOLS 1... Welding gun, 2... Fixed electrode, 3... Arm, 4... Cylinder, 5... Piston, 7... Movable electrode, 8... Bulkhead, 9... Auxiliary Cylinder, 10...
・Reverse pipe connection port, 11... Piston, 13...
・Stock bar 14... Receiving frame, 18... Spring.

Claims (1)

[Scope of utility model registration request] A movable electrode 7 connected to a piston 5 of a cylinder 4 and a fixed electrode 2 corresponding to the movable electrode 7 are attached to a welding gun 1 that is attached to an arm 3 protruding from the outer circumference of the cylinder 4, and a partition wall 8 is attached to the cylinder 4. An auxiliary cylinder 9 for retraction is provided which communicates with the retraction pipe connection port 10 of the cylinder 4 through the piston 11 of the cylinder 9, and a stopper 13 whose length can be adjusted freely is provided. A welding gun for a robot, characterized in that the cylinder 4 is slidably supported by the cylinder 4.